1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/leds/backlight/kinetic,ktz8866.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Kinetic Technologies KTZ8866 backlight
8
9 maintainers:
10 - Jianhua Lu <lujianhua000@gmail.com>
11
12 description: |
13 The Kinetic Technologies KTZ8866 is a high efficiency 6-channels-current-sinks
14 led backlight with dual lcd bias power.
15 https://www.kinet-ic.com/ktz8866/
16
17 allOf:
18 - $ref: common.yaml#
19
20 properties:
21 compatible:
22 const: kinetic,ktz8866
23
24 reg:
25 maxItems: 1
26
27 vddpos-supply:
28 description: positive boost supply regulator.
29
30 vddneg-supply:
31 description: negative boost supply regulator.
32
33 enable-gpios:
34 description: GPIO to use to enable/disable the backlight (HWEN pin).
35 maxItems: 1
36
37 current-num-sinks:
38 description: number of the LED current sinks' channels.
39 $ref: /schemas/types.yaml#/definitions/uint32
40 enum: [1, 2, 3, 4, 5, 6]
41
42 kinetic,current-ramp-delay-ms:
43 description: |
44 LED current ramping delay time in milliseconds, note that the
45 case 1 will be mapped to 1μs.
46 enum: [1, 2, 4, 8, 16, 32, 64, 128, 192, 256, 320, 384, 448, 512, 576, 640]
47
48 kinetic,led-enable-ramp-delay-ms:
49 description: |
50 LED on/off ramping delay time in milliseconds, note that the case 0 will be
51 mapped to 512μs because ktz8866 can't ramp faster than it.
52 enum: [0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384]
53
54 kinetic,enable-lcd-bias:
55 description: Set if we want to output bias power supply for LCD.
56 type: boolean
57
58 required:
59 - compatible
60 - reg
61 - vddpos-supply
62 - vddneg-supply
63 - enable-gpios
64
65 unevaluatedProperties: false
66
67 examples:
68 - |
69 #include <dt-bindings/gpio/gpio.h>
70
71 i2c {
72 #address-cells = <1>;
73 #size-cells = <0>;
74
75 backlight@11 {
76 compatible = "kinetic,ktz8866";
77 reg = <0x11>;
78 vddpos-supply = <&bl_vddpos_5p5>;
79 vddneg-supply = <&bl_vddneg_5p5>;
80 enable-gpios = <&tlmm 139 GPIO_ACTIVE_HIGH>;
81 current-num-sinks = <5>;
82 kinetic,current-ramp-delay-ms = <128>;
83 kinetic,led-enable-ramp-delay-ms = <1>;
84 kinetic,enable-lcd-bias;
85 };
86 };
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